A268743 Number of n X n binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

2, 11, 143, 4110, 255651, 34732937, 10319681062, 6744840113811, 9736268648482947, 31152408949342676906, 221573405414594347811555, 3511390061199964238627005057, 124222798189336185449669887550302

Offset: 1

Author

R. H. Hardin, Feb 12 2016

Keywords

• nonn

Comments

Diagonal of A268750.

Examples

			Some solutions for n=4
..0..0..1..0. .0..1..1..0. .1..0..0..0. .0..0..0..1. .1..0..0..1
..1..0..0..1. .0..0..0..0. .0..0..1..0. .0..1..0..0. .0..0..0..0
..0..0..0..0. .0..1..0..1. .0..0..0..1. .0..1..0..1. .0..0..1..0
..0..0..0..0. .0..0..0..0. .0..1..0..1. .1..0..0..0. .1..1..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..26

Crossrefs

Cf. A268750.